/// Copyright (c) 2018 Razeware LLC
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// Notwithstanding the foregoing, you may not use, copy, modify, merge, publish,
/// distribute, sublicense, create a derivative work, and/or sell copies of the
/// Software in any work that is designed, intended, or marketed for pedagogical or
/// instructional purposes related to programming, coding, application development,
/// or information technology.  Permission for such use, copying, modification,
/// merger, publication, distribution, sublicensing, creation of derivative works,
/// or sale is expressly withheld.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

import Foundation
import RxSwift

public class ProfileViewModel {

  // MARK: - Properties
  public let userSession: UserSession
  public let userProfile: UserProfile
  let notSignedInResponder: NotSignedInResponder
  let doneWithProfileResponder: DoneWithProfileResponder
  let userSessionRepository: UserSessionRepository

  public var errorMessages: Observable<ErrorMessage> {
    return errorMessagesSubject.asObservable()
  }
  private let errorMessagesSubject = PublishSubject<ErrorMessage>()

  // MARK: - Methods
  public init(userSession: UserSession,
              notSignedInResponder: NotSignedInResponder,
              doneWithProfileResponder: DoneWithProfileResponder,
              userSessionRepository: UserSessionRepository) {
    self.userSession = userSession
    self.userProfile = userSession.profile
    self.notSignedInResponder = notSignedInResponder
    self.doneWithProfileResponder = doneWithProfileResponder
    self.userSessionRepository = userSessionRepository
  }

  @objc
  public func dismiss() {
    doneWithProfileResponder.finishedViewingProfile()
  }

  @objc
  public func signOut() {
    userSessionRepository.signOut(userSession: userSession)
      .done { _ in
        self.notSignedInResponder.notSignedIn()
      }
      .catch { error in
        let errorMessage = ErrorMessage(title: "Sign Out Error",
                                        message: "We ran into an unexpteded error and we couldn't sign you out.\nPlease try again.")
        self.errorMessagesSubject.onNext(errorMessage)
      }
  }
}
